How much water will a 36 pipe hold per foot?

To calculate the volume of water a 36-inch pipe can hold per foot, first find the cross-sectional area using the formula for the area of a circle, (A = \pi r^2). The radius of a 36-inch pipe is 18 inches (or 1.5 feet). Therefore, the area is approximately (A = \pi (1.5)^2 \approx 7.07) square feet. Since the volume per foot is the area times the length (1 foot), the pipe will hold approximately 7.07 cubic feet of water per foot.